Chaser holder with heeled clamps



March 1934 c. A. REIMSCHISSEL ET AL 1,951,291

' CHASER HOLDER WITH HEELED CLAMPS Filed Dec. 12, 1932 as as as 7 I-T E H E. 76

/ I I 1 4 Z! a glwue'ntoz bar/aAReima/fiml 9 t/madgfiar mr surface on a Patented Mar. 13, 1934 UNITED STATES PATENT OFFICE 1,951,291 CHASER HOLDER WITH HEELED CLAMPS Charles A. Reimschissel and James G. Harper,

Waynesboro, Pa., assignors to Landis Machine Company, Pennsylvania Waynesboro, Pa.,

a corporation of Application December 12, 1932, Serial No. 646,932

6 Claims. (Cl. -104) M This invention relates to holders and clamps for thread cutting chasers of die heads.

The object of the invention is to provide a chaser holder and clamp which will insure perfect 5 seating of the chaser in spite of the presence of foreign particles such as cuttings from the work and at the same time will provide a firm backing up of the chaser to resist the thrust against the thread cutting instrumentalities.

A further object is to provide means for securing the clamp against moveme t toward the chaser thereby holding the chaser firmly in position on the block.

A further object is to provide means for easily lifting the clamp off its seat and for releasing the chaser.

For purpose of convenience in distinguishing this clamp we have termed it the heeled type of clamp.

Referring to the accompanying drawing, which is made a part hereof and on which similar reference characters indicate similar parts,

Figure 1 is a plan view of a holder and a pair of clamps showing the clamps applied to a tangential chaser, V r v Figure 2, a similar plan view of a holder having a single clamp,

Figure 3, a modified form of holder,

Figure 4, a section on line 4-4 of Figure 1,

Figures 5 and 6 are a plan view and a side elevation respectively of a chaser clamp,

Figures '7, 8 and 9 are section views similar to Figure 4 showing modified forms of clamps in position in the holders;

Figures 10, 11 and 12 are plan views, respectively, of the clamps shown in section in Figures '7, 8 and 9,

, Figure 13 is a section on line 13-13 of Figure 1, and

Figures 14 and 15 are an inverted plan view and a face view respectively of the block shown in Figure 3.

Several different embodiments or means for accomplishing this purpose are shown. In Figure 45 1 numeral indicates a holder block having a socket 21 and a slot 22 by means of which the block is secured to a die head and operated thereon. The block is provided with a beveled seat' 23 and a face portion 24 against which the base 50 and back portion respectively of the chaser 41 may seat. The block is also provided with sockets 25 in which holding clamps 26 are seated and held in place by bolts 32. A clearance 29 is provided between the face of the clamp and the adjacent cut-away portion of the chaser.

movement as the bolt 32 is screwed tightly into The block is provided with face portions 30 which extend somewhat further out than the surfaces 24 and engage the surface of the cut-away portion of the chaser. This provides a rigid backing up of the chaser, for the chaser is supported against surfaces 24 and 30 on the block. The clearance at 29 insures perfect seating of the clamp and the chaser in spite of the presence of any iron cuttings or burrs.

The clamp shown in detail in Figures 5 and 6 has a depending cylindrical portion 35' which engages a socket 36 in the block 20. The rear portion of the clamp has a heel 33 which seats upon afiat surface 34 forming the bottom of the socket in the holder. A clearance is provided at 18between the clamp and the block. The lower rear edge of the clamp moreover is cut off or beveled at28 to provide a clearance pocket at the lower rear corner of the clamp. This insures perfect seating of the clamp in case iron cuttings or burrs may lodge in this corner of the socket. The lower front edge of the clamp has a depending lip 37 which engages a correspondingly beveled portion 38 on the chaser to hold the chaser in position on the holder. A spring ring '70 is fitted into a groove in the bolt 32 and serves to force the clamp out of its socket when the bolt is backed out. When the clamp is applied to the holder to secure the chaser in posi ion the bolt 32 is driven home, the heel portion 33 engaging the bottom of the socket in theholder and the lip 37 engaging the beveled portion 38 on the chaser. The cylindrical portion 35 on the clamp fits neatly in the socket 36 to hold the clamp against forward the block. This prevents the clamp from moving toward the chaser and thus insures that the chaser will be firmly held against the face 24 of the block.

In Figure 2 the clamp and holder are similar to those shown in Figure 1 except that a single clamp is used in this instance. The block 39 is provided with shoulder portions 40 against which the cut-away portion of the chaser abuts, a clearance 42 being provided between the face of the clamp and the adjacent surface on the cut-away portion of the chaser.

The back of the chaser of course engages and is supported against a surface corresponding to surface 24 shown in Figures 4 and 13.

In the form shown in Figure 3 the holder block 43 slides radially to move the chasers into and out of thread cutting position. The block is secured on a die head by a slide '76 which fits in a corresponding groove in the die head and is moved 110 radially by a cam on the die head, not shown, engaging a beveled slot 77 in the holder. The side of the slot has a rib 78 which is engaged by a corresponding portion of the cam to effect movement of the block. The chaser seats against shoulder portion 44 and also against the surface on the block which corresponds to the surface 24 shown in Figures 4 and 13. A clearance is provided at 45 between the face of the clamp and the adjacent surface on the cut-away portion of the chaser.

The section views 4 and 13 show the structure and positions of the chaser and clamp used in Figures 2 and 3 as well as those shown in Figure 1.

In the form shown in Figures 7 and 10 the clamp 46 has a heel portion 47 which engages a fiat surface 48 in the holder. The lower rear edge of the clamp is cut-off as shown at 51 to provide a clearance pocket at this point. A clearance 5.0 is provided at the front of the heel and between the body of the clamp and the surface 48. A lip- 52 engages a beveled edge on the chaser to hold the chaser in position. A shoulder '71 on the clamp engages a shoulder 72 on the holder to prevent outward movement of the clamp. The clamp is secured to the holder block 49 by means of a bolt 54. As inthe other form a clearance is provided at 53 between the face of the clamp and the adjacent surface on the cut-away portion of the: chaser. A spring ring is provided for lifting the clamp out of its socket when the screw 54 is backed out.

In the form shown in Figures 8 and 11 the clamp 55- is held against forward movement by a pin 56. The block 5'7is provided with a ridge 58 upon which the. rear side of the clamp rests. The chaser is held in place in the block by means of a depending lip 59. The clamp is secured by a bolt 61. When the bolt 61 is screwed home the clamp will grip the chaser and hold it in position and the pin 56 will prevent any tendency of the clamp to ride toward the chaser. The chaser therefore will be securely held in position.

In the form shown in Figures 9 and 12 the clamp has a heel 62 which engages the surface 64 forming the bottom of a socket in the block and a clearance is provided at 66 and 67. A shoulder 73 on the clamp engages a corresponding edge '74 in the block to hold the clamp against movement toward the chaser. The chaser is held in position by the usual depending lip 68 and a clearance is provided at 69 between the face of a clamp and the adjacent portion of the chaser. As in theother forms a spring ring 63 is fitted in a groove in the bolt so that when the screw is backed out the clamp will be lifted out of its socket.

It will be obvious to those skilled in the art that various changes may be made in our device without departing from the spirit of the invention and therefore we do not limit ourselves towhat is shown in the drawing and described in the specification, but only as indicated by the appended claims.

Having thus fully described our said invention what we claim as new and desire to secure by Letters Patent, is:

I. In combination a chaser holder and clamping means for a threading die head comprising a block having a seat for a chaser and having one or more sockets with clamps mounted therein, said clamps having cylindrical depending portions adapted to seat in corresponding cylindrical sockets in the block to hold the clamps in fixed position in the block and having depending edges at their rear sides for supporting the rear of the clamps upon the bottoms of the sockets and having depending lips at their front sides for engagement with a corresponding shoulder on the chaser, substantially as set forth.

2. In combination a chaser holder and. clamping means for a threading die head comprising a block having a seat for a chaser and having one or more sockets with clamps mounted therein, said clamps having cylindrical depending portions adapted to seat in corresponding cylindrical sockets in the block and having depending edges at their rear sides for supporting the rear of the clamps upon the bottoms of the sockets and having depending lips at-their front sides for engagement with a corresponding shoulder on the chaser, said clamps having their faces spaced apart from the adjacent surface on a cut-away portion of the chaser to provide a clearance, substantially as set forth.

3. In a threading die head a combined chaser holder and clamp comprising a bloc-k having a longitudinal groove in one face adapted to receive a chaser and having a plurality of sockets for receiving clamps for holding the chasers in position on the block, each clamp having formed thereon. a depending annular portion adapted to seat in a corresponding cylindrical socket in the block'to hold the clamp in fixed position in the block and having a rear heel in engagement with the block for supporting the clamp on the block, substantially as set forth.

4. A clamp and holder for thread cutting chasers of a die head comprising a block. having a beveled seat adapted to receive a chaser and having 'a. plane face and an onset parallel plane portime against which a portion of the chaser seats, the said block having a socket cut therein and a clamp seated in the socket, said sockethaving a smaller socket cutout of its bottom and the said clamp having a depending portion engagingin this smaller socket, said clamp having an overhanging portion adapted to engage a shoulder on the chaser and having a rear heel portion adapted to seat on the bottom of the first named socket to support the clamp, the face of the clamp being spaced from the adjacent surface on a cutaway portion of the chaser, substantially as. set forth.

5. In a threading die head, a chaser holder and clamp comprising a block having a seat for a chaser and having a face adjacent said seat for receiving the back portion of the chaser and having a second plane surface parallel with said face and offset therefrom for receiving a surface on a cut-away portion of a chaser, the block having a socket to receive a clamp, the face of the clamp being spaced from the adjacent face on the cutaway portion on the chaser, the clamp having formed thereon a depending portion adapted to be received in the socket in the block to hold the clamp against forward movement in the block and having a rear heel upon which the rear portion of the clamp rides, the forward portion of the clamp having a lip adapted to engage a corresponding beveled portion on the chaser, substantially as set forth.

6. In combination a chaser holder, clamp and tangential chaser for a threading die head coms prising a block having a seat for the chaser and having a socket with a clamp mounted therein, the said clamp having a cylindrical depending portion adapted to seat in a corresponding cylindrical socket in the block to hold the clamp in on the chaser, said clamp having its face spaced apart from the adjacent surface on the cut away portion of the chaser to providea clearance between the ciamp and. the chaser.

CHARLES A. REIMSCHISSEL. JAMES G. HARPER. 

